Analysis of active ricin and castor bean proteins in a ricin preparation, castor bean extract, and surface swabs from a public health investigation

In late February 2008, law enforcement officials in Las Vegas, Nevada, discovered in a hotel room, a copy of The Anarchist Cookbook, suspected castor beans and a "white powder" thought to be a preparation of ricin. Ricin is a deadly toxin from the seed of the castor bean plant (Ricinus communis). The United States regulates the possession, use, and transfer of ricin and it is the only substance considered a warfare agent in both the Chemical and the Biological Weapons Conventions. Six samples obtained from the hotel room were analyzed by laboratories at the Centers for Disease Control and Prevention using a panel of biological and mass spectrometric assays. The biological assays (real time-PCR, time resolved fluorescence and cytotoxicity) provided presumptive evidence of active ricin in each of the samples. This initial screen was followed by an in-depth analysis using a novel, state-of-the-art mass spectrometry-based ricin functional assay and high sensitivity tandem mass spectrometry for protein identification. Mass spectrometric analysis positively identified ricin and confirmed that in each of the samples it was enzymatically active. The tandem mass spectrometry analysis used here is the most selective method available to detect ricin toxin. In each sample, ricin was unequivocally identified along with other R. communis plant proteins, including the highly homologous protein RCA120. Although database searches using tandem mass spectra acquired from the samples indicated that additional controlled substances were not present in these samples, the mass spectrometric results did provide extensive detail about the sample contents. To the best of our knowledge following a review of the available literature, this report describes the most detailed analysis of a white powder for a public health or forensic investigation involving ricin.     

Investigating the Causal Effects of Arts Education

There is a paucity of research on the causal relationship between arts learning and educational outcomes. Investigating these relationships has become imperative as policymakers increasingly prioritize empirical evidence of educational impacts, which often leads to curriculum narrowing that favors traditionally-tested subjects. Employing a randomized controlled trial with 42 elementary and middle schools in Houston, Texas, we find that randomly assigning arts educational opportunities reduces disciplinary infractions, improves writing achievement, and increases students’ emotional empathy. Students in elementary schools, which were the primary focus of the program, also experience increases in school engagement, college aspirations, and cognitive empathy. As the first large-scale randomized control trial of arts learning in an authentic school setting, these findings provide strong evidence that the arts can produce meaningful impacts on students’ academic outcomes and social-emotional development. Education policymakers should consider these benefits when assessing the role of the arts in schools.